Fission impossible? Not for scientists working on the first atomic bomb at a secret lab in Los Alamos, N.M., during WWII in the new drama "Manhattan." Ashley Zukerman, David Harbour and Daniel Stern star. 6, 7:10 and 9 p.m. WGN America; 8 p.m. KTLA

This Belgian doesn't waffle: Agatha Christie's Hercule Poirot (David Suchet) is back on the case on a new "Masterpiece Mystery!" 9 p.m. KOCE

It's kill or be kilt when "Bannockburn: The Real Bravehearts" recalls a key battle in the First War of Scottish Independence. 9 p.m. National Geographic

Some like it cold, but others, not so much, in two new series "Ice Lake Rebels" and "Escaping Alaska." 10 p.m. Animal Planet; 10 p.m. TLC

MONDAY

"Running Wild With Bear Grylls" has the outdoorsman paired with stars like Zac Efron and Channing Tatum for a series of one-on-one adventures. 8 p.m. NBC